Yea, thalls and ar6s are identical, only difference is the cores. one has the ar1 and one has the ar2 core (I think that's what they're called) Basically the thall has one strip of denser wood in the core and ar6 has two strips of the denser wood so they are a smidge heavier and stiffer. at least that's what I got, if you go on armada's site they have a pretty clear explanation of the two cores but I haven't looked at it in a while so I might've forgot exactly how it went.